Tube Power Amp Reviews

Description: Monoblock tube power amplifier with switchable Ultralinear or triode output stage. Tube complement: eight 5881/6L6, four 6SN7, one Raytheon or WE 5842/417A. Bias: class-AB1 fixed bias with individual adjustment, 6dB global differential feedback (first stage not in feedback loop). Specified output power: 100Wpc into 8, 6, 4, or 2 ohms (20dBW), 115–130W at visible clipping (Ultralinear); 55Wpc into 8, 6, 4, or 2 ohms (17.4dBW) (Triode). Input impedance: 110k ohms single-ended, 200k ohms balanced. Voltage Gain: 26.5dB. Distortion: 1% THD at full rated power, 20Hz–20kHz. Power consumption: 400W average, 600W full power, 125W auto-bias standby, 75W standby.
Dimensions: 15" W by 8.5" H by 25" D. Net weight: 68 lbs each.
Serial numbers of units reviewed: 98103001, 98103002.
Price: $15,000/pair (1999); no longer availabe (2010). Approximate number of dealers: 15.
Manufacturer: AudioPrism, Redmond, WA 98052 (1999); PO Box 24203, Seattle, WA 98124. Tel: (425) 922-2197 (2010). Web: www.audioprism.com.